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+# Fluent Bit / wasi_serde_json
+
+This source source tree provides an example of WASM program with WASI mode.
+
+## Prerequisites
+
+* Rust
+  * rustc 1.61.0 (fe5b13d68 2022-05-18)
+* [rustup](https://rustup.rs/) (For preparing rust compiler and toolchains)
+
+## How to build
+
+Add `wasm32-wasi` target for Rust toolchain:
+
+```console
+$ rustup target add wasm32-wasi
+```
+
+Then, execute _cargo build_ as follows:
+
+```console
+$ cargo build --target wasm32-wasi --release
+```
+
+Finally, under target/wasm32-wasi/release directory, `*.wasm` file will be created:
+
+```console
+$ ls target/wasm32-wasi/release/*.wasm
+target/wasm32-wasi/release/wasi_serde_json.wasm
+```
+
+## How to confirm WASI integration
+
+Create parsers.conf as follows:
+
+```ini
+[PARSER]
+    Name        wasi
+    Format      json
+    Time_Key    time
+    Time_Format %Y-%m-%dT%H:%M:%S.%L %z
+```
+
+And Create fluent-bit configuration file as follows:
+
+```ini
+[SERVICE]
+    Flush        1
+    Daemon       Off
+    Parsers_File parsers.conf
+    Log_Level    info
+    HTTP_Server  Off
+    HTTP_Listen  0.0.0.0
+    HTTP_Port    2020
+
+[INPUT]
+    Name exec_wasi
+    Tag  exec.wasi.local
+    WASI_Path /path/to/wasi_serde_json.wasm
+    Parser wasi
+
+[OUTPUT]
+    Name  stdout
+    Match *
+```